Fabricated derrick



B. BLACK FABRICATED DERRICK Sept. 28 1926. Lemmas Filed Nov. LO 1925 3Sheets-Sheet 1 INVENTOR.

BY J M MTORNEY B. BLACK FABRICATED DERRICK .fisept. 28, 1926.

Filed Nov. 10. 1925 3 Sheets-Sheet 2 Sept. 28 1926. 1,601,059

B. BLACK FABRICATED DERRI CK v Filed Nov. 0 [925 3 Sheets-Sheet :5

INENTOR.

BY flm %%Z@7TTORNEY the panel sections of which the other two sides ofthe derrick are formed.

' The derrick illustrated in the drawings is shown as being made outstructural steel shapes, but it is to be understood that the presentinvention in its broad aspect is not restricted to any particularmaterial the specific embodiment disclosed being primarily intended forthe purpose of illustrating a practical application or the principles ofconstruction involved.

As shown, each of the four sides of the derrick is formed of a pluralityof panel sections secured together in vertical alignment with theseveral sections of the respective sides of suitable dimensions toproduce a completed derrick gradually converging or tapering upwardly tothe derrick top upon which will be mounted the usual crown-block.

The panel sections A of two opposite sides are of relatively similarconstruction and the panel sections B of the other two sides are also ofrelatively s iilar construction, but slightly dillerent Irom the panelsections A, therefore it will sullice herein to describe in detail oneof each of the sections A and B.

Each panel section A comprises opposite angle-iron leg members adisposed vertically at slightly converging angles correspond ing to thegeneral taper ot' the completed derrick, lower and upper transversemarginal girts 2 and 3, (so called because they form the lower and upperniargines of the panel) an intermediate transverse girt i, a lower pairof diagonal sway braces 5 and 6, an upper pair of similar diagonal swaybraces 7 and S, and lower and upper reinforcing vertical braces 9 and10. All of these braces and girts are of angle-iron form and are swagedat opposite ends to bring poth flanges thereof to parallel contact, thusproviding securing ends or double thickness which are bored or punchedto receive securing rivets or bolts. The several girts and sway bracesare positioned to engage the inner faces of the adjacent flanges of therespective leg members a, the horizontal flanges of the marginal girts 2and 8 extending inwardly, the respect ve horizontal flanges ot' theintermediate rt and of the sway braces 5 and 7 eXt-encing outwardly,while the respective horizontal flanges of the sway braces 6 and 8extend inwardly, the opposite ends of these girts and sway braces beingsecured to the respective leg members a preferably by bolts and nutswith the bolt heads on the inside and the associated nuts tightenedagainst the outer face of the respective leg. members. These severalbolts are designated by reference characters consisting of a sufiixadded to the numeral designating the respective parts they secure to themembers, thus the bolts 2 secure the transverse marginal girt :2 to thelower ends of the leg members a, the bolts 3 secure the transversemarginal girt 3 to the upper ends of said leg members while the bolts itff T and ti secure the intermediate girt and the respective diagonalsway braces to said leg members. The upper end of the. verticalrcinlorcing brace 9 is positioned between the two diagonal sway bracesand (S at their point of crossing and is secured to the vertical flangesof both of said sway braces by a bolt 5) (see Fig. and the lower end ofsaid vertical brace U is secured against the inner lace of the verticalflange oi the marginal gilt 2 by a bolt 9 The vertical brace ll)similarly secured between and to the vertical flanges of the diagonalsway braces i and S by a bolt 10 and to the vertical llange of theintermediate girt l: by a bolt 10".

This provides a complete rigid panel unit which. will hold its shapeduring shipping and throughout its handling during erection anddismantling as well as while assembled in the derrick structure.

Each panel section B comprises opposixo angle-iron leg members 6, lowerand upper transverse marginal girts 1'2 and 13, an intcrmediatetransverse girt ll, a lower pair of diagonal sway braces and 1(5, anupper pair ol diagonal sway braces 17 and 1S, and lower and upperreinforcing vertical braces 19 and 20. All of these girls and braces areof the same construction as those of the panel sections A. However theirends are secured by bolts to the outer :l'aces ot the adjacent llangesof the respective leg members Z) instead of to the inner faces as arethe braces and girts ot' the sections A. Bolts 12 secure the ends of thelower marginal gn't 12 to the lower ends oi the respective leg members0. bolts 13 secure the ends of the upper marginal girt 13 to the upperends ol the respective leg members 6, while bolts 14, l5, l6, l7 and 1Ssecure the intermediate girt l-l and the respective diagonal sway bracesto the leg members 6. The vertical braces 19 and 21) are positioned inthe same relative positions as are the like braces of the sections itand are secured in position by bolts l9, l9" and bolts and 20".

\Vhile it is evident and is clearly realized that the derrick may, ifdesired. be erected piece by piece, the preferred method to be followedin practice will be to pie-assemble the various panel sections. leavingto the lield crew only the work of assembling these panel sections intoa completed derrick. 'i'here'lore, 1 will. "for the purpose of thisdisclosure, limit the description of the erect on to the manner in whichthe several sections are secured together to form the completedstructure, it, of course, being understood that the erection will beprogressive from the bottom to the top of the derrick,

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andfurther, thatas the sections of the different sides are inbreak-joint relationship two of'the lowermost and two of the topsections will be of dilferent relative height than the rest of thesections so that the derrick may have alevel base and end with a leveltop.

lVith particular reference to Figs. 1, 3 and l, it will benoted-thateach A section is vertically aligned with and rests upon the next lowerA sectionwith the horizontal flanges of the marginal girts thereof inengagement. That is, the marginal girt 2 of onepanel section engages themarginal girt of-the next lower section. The horizontal flanges oi.these-coengaging marginal girts are secured together throughout theirlengths by relatively spaced'bolts 21, this being one of the reasons,why it is not neces saryto provide joint-plates for the leg members.

The severalpanel' sections B alsoare assembled-in the same manner witheach B section vertically aligned with and resting upon-the next lowerBsection andwith the coengaging marginal girts 12 and 13 secured togetherby bolts 21.

vi hilethesections A and B are secured tothe companion A- and B'sectionsin the same manner, itwillbe seen, with particular reference to Figs. 3and" t, that the adjacent A and B section's overlap each otherbyone-half their-respective heights, thus bringing the joints 22' betweenthe vertically adj acent A sections in regular staggered relation tothejoints 22 be-tweenthe vertically adjacent 13 sections, this being afurther reason for the elimination of joint-plates for the leg members.

Referring now more particularly to Fig. 2 of the drawings, it will benoted that the panel sections A are assembled with the panel sections Bsothat the angle-iron leg members a have an intermeshing or overlappingengagement with the angle-iron leg members Z) or" the panel sections B,with each leg angle engaging the heads of the several bolts which securethe several girts and braces to their respective leg members, thusforming at each corner of the derrick a corner post or leg of doubleconstruction.

With the panel sections thus assembled the nested leg members aresecured together at intervals by bolts A and B, each oi said boltsextending through the flanges of both leg members a and Z) of eachcorner post or the derrick. These leg bolts A and B are preferablypositioned on opposite sides of and closely adjacent to the points ofsecurance of the respective girts and braces and if desired additionalleg bolts may be positioned between such points as indicated in Fig. 1.

This preferred method of assembling the panel sections is followedthroughout the erection of the entire derrick, with a great saving inthe time'and expense of fielderection over the-usual methods now invogue, this being of great importance invview of the fact that derrickor rig-builders are highly skilled.

It will thus be evident that all fabrication and pre-assembling whichmay be per formed ina factory or shop with relatively cheaper laborrepresents a cost saving of major importance.

From the above it will be seen that the present invention provides aderrick of an exceptionally strong and rigid character which will becapable of withstanding hard usage, one of the most important featurescontributing to this superior strength and rigidity beingthe fact thatthe several panels break joint at the marginal'girts and inverticallystaggered relationship and that the. marginal girts are secured togetherthroughout-their lengths thereby producing-a construction which is agreat deal stronger against transverse strains than any derrickstructure which is securedtogether only; at the leg joints.

It will also be evident that this invention provides a completepanel-derrick which can be erected or dismantled with maximum speed anda minimum fieldcost and which, even it constructed of wood,- can bedismantled with practically no deterioration or breakage as'comparedwith the usual types of 'nailed derricks.

While the specific embodiment ofi the invention herein illustrated anddescribed is fully capable of fulfilling all of 'theobjects primarilystated; it. is to-beunderstood that I do not wish to limit the inventionin this regard, for it is susceptible of embodiment in various otherforms, all coming within the scope of the following claims.

I claim as my invention:

1. In a derrick of the nature disclosed, the combination of: relativelyspaced corner legs each comprising a plurality of longitudinally-alignedleg sections; lower transverse girts connected at opposite ends to therespective lower ends of the leg sections of adj acent legs; uppertransverse girts connected at opposite ends to the respective upper endsof said leg sections; and means for securing each lower girt to thevertically adjacent upper girt.

2. In a derrick of the nature disclosed, the combination of: fourrelatively spaced corner legs each comprising a double string oflongitudinally aligned angle leg sections, one string nested within theother with their flanges in parallel relationship with the adjacentsides of the derrick; lower transverse girts disposed on opposite sidesof the derrick and connected at opposite ends to the respective lowerends of the inner leg sections of the adjacent legs; upper transversegirts on said opposite sides of the derrick and connected at oppositeends to the respective upper ends of said inner leg sections; otherlovver transverse girts disposed on the other sides of the derrick andconnected at opposite ends to the respective lower ends of the outer legsections; other upper transverse girts disposed on said other sides ofthe derrick and connected at opposite ends to the respective upper endsof said outer leg sections; and means for connecting each lowertransverse girt to the vertically adjacent upper transverse girt.

3. In a derrick ol the nature disclosed, the combination of: tourrelatively spaced corner legs each comprising a double string 0tlongitudinall v aligned angle leg sections, one string nested within theother with their flanges in parallel relationship with the adjacentsides of the derrick; loiver transverse girts disposed on opposite sitesof the derrick and connected at opposite ends to the respective lOWCl'ends of the inner leg sections of the adjacent legs: upper transversegirts on said opposite sides or? the derrick and connected at oppositeends to the respective upper ends of said inner legsections; other lOWCltransverse girts disposed on the other sides of the derrick andconnected at opposite ends to the respective lOWCl ends of the outerleg; section other upper transverse girts disposed on said other sidesot the derrick and connected at opposite ends to the respect've upperends of said outer leg sections; and means tor connecting each lowertransverse girt to the vertically adjacent upper transverse girt; theinner leg sections of each corner leg being disposed in girts secured tothe transverse marginal girts ot the vertically ad acent panel sec.-

ingeach of its sides termed of complete pre- -Q1i'ibl d panel sectionshaving transverse marginal girts, with the several panel sectionssecured together at the corners ot the derrick and the transversemarginal girls of each panel sec ion secured t'o thc transverse marginalirts ot the vertically adjacent panel sections.

1. A derrick ot the nature disclosed having; eaeh of its sides formed ofcomplete preassen'ibled panel sections, with the several panel sectionssecured together at the corners of the derrick and to the verticallyadjacent panel sections, the panel sections of each side being disposedin break-joint relationship vvith those of the adjacent; sides.

In testimony \vhereot. I have hereunto s t my hand at Los Angeles.Calil'ornim this 3rd day of November. 1925.

BURT X BLACK.

